package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    /**
     * 开始时间戳
     */
    private static final long BEGIN_TIMESTAMP = 1735689600L;
    /**
     * 序列号的位数
     */
    private static final int COUNT_BITS = 32;

    private StringRedisTemplate stringRedisTemplate;


    public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }


    public long nextId(String keyPrefix) {
        // 1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;

        // 2.生成序列号
        // 2.1.获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        // 2.2.自增长
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);

        // 3.拼接并返回
        return timestamp << COUNT_BITS | count;
    }


    public void incrementExample() {
        // 如果 "myCounter" 不存在，Redis 会先把它初始化为 0，然后加1
        Long newValue = stringRedisTemplate.opsForValue().increment("myCounter");
        System.out.println("新的值是: " + newValue);
    }

/*    public static void main(String[] args) {
*//*        LocalDateTime of = LocalDateTime.of(2025, 1, 1, 0, 0, 0);
        long l = of.toEpochSecond(ZoneOffset.UTC);
        System.out.println(l);*//*
        new RedisIdWorker().incrementExample();
    }*/
}
